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Published on: May 25, 2020
Online circular contrast perimetry via a web-application: optimising parameters and establishing a normative database
Simon Edward Skalicky1,2, Deus Bigirimana3, Lazar Busija
1Glaucoma Investigation and Research Unit, the Royal Victorian Eye and Ear Hospital, Melbourne, VIC, Australia. seskalicky@gmail.com.
Purpose:
To establish a normative database and optimise parameters for personal-computer based perimetry via a web-application using circular contrast targets.
Methods:
Online 24-degree 52-loci perimetry was delivered through a web-application using circular flickering contrast targets. Embedding contrast differentials within targets allows calculation of relative decibel (rdB) per 256-bit greyscale level differential. Target light-band maximum brightness colour was fixed, while the dark-band varied to achieve the desired rdB level. A staircase system was used with two reversals ranging from 0 to 36 rdB levels. Blind spot localisation at the start of the test was used to optimise viewing distance and subsequently count fixation losses. Gaze was maintained on a spinning golden star which moves mid-test to maximise sampling area. Patients performed the test to each eye separately using a computer in a darkened room at 40-45 cm.
Results:
158 eyes of 101 patients completed the Online Circular Contrast Perimetry (OCCP) test. Mean age was 62.9 ± 14.3 years old. Mean sensitivity reduced with age, at 1.0 relative decibel per decade. Mean sensitivity per locus correlated with standard automated perimetry (SAP) in a physiological hill of vision, with an average difference of 4.02 decibels (95% confidence interval (CI) = 3.77-4.27, p < 0.001) and good agreement between tests.
Conclusions:
Online circular contract perimetry provides accurate perimetric testing with comparable results to standard automated perimetry.
